US6070323A - Piston for internal combustion engine and material therefore - Google Patents

Piston for internal combustion engine and material therefore Download PDF

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Publication number
US6070323A
US6070323A US09/022,647 US2264798A US6070323A US 6070323 A US6070323 A US 6070323A US 2264798 A US2264798 A US 2264798A US 6070323 A US6070323 A US 6070323A
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US
United States
Prior art keywords
piston
forming
set forth
alloy
silicon
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09/022,647
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English (en)
Inventor
Toshikatsu Koike
Hirotaka Kurita
Hiroshi Yamagata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Motor Co Ltd
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Yamaha Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP9042951A external-priority patent/JPH10219383A/ja
Priority claimed from JP4470997A external-priority patent/JPH10219378A/ja
Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA reassignment YAMAHA HATSUDOKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAGATA, HIROSHI, KOIKE, TOSHIKATSU, KURITA, HIROTAKA
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Publication of US6070323A publication Critical patent/US6070323A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/002—Making metallic powder or suspensions thereof amorphous or microcrystalline
    • B22F9/008—Rapid solidification processing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0408—Light metal alloys
    • C22C1/0416—Aluminium-based alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49256—Piston making with assembly or composite article making
    • Y10T29/49263—Piston making with assembly or composite article making by coating or cladding

Definitions

  • This invention relates to a piston for a reciprocating machine and more particularly to an improved material and process for forming such a piston.
  • a conventional engine piston has a piston head which faces and defines in part the combustion chamber. This piston head may be formed with one or more piston ring grooves for sealing purposes with the associated cylinder bore.
  • the piston has a skirt portion that provides slidable engagement with the cylinder bore.
  • the skirt portion should have very high abrasion resistance and strength to prevent cracking or breaking.
  • the piston be light in weight and to have a relatively thin wall construction, particularly in the skirt area, to accomplish this light weight.
  • the light weight obviously reduces the reciprocating forces and the amount of weight that must be balanced.
  • the material should also be high in fatigue strength, particularly under high temperatures and provide high abrasion resistance.
  • the piston is formed by a casting process.
  • a difficulty with the casting process for forming the piston is that the molding of the piston and subsequent solidification causes the solidified texture of the metal to become relatively coarse and thus reduce its strength and creates brittleness. Forging can avoid these tendencies.
  • Iron (Fe) is also frequently added to increase the abrasion resistance and fatigue strength of the finished piston.
  • the utilization of these alloying materials in a casting process gives problems upon solidification. This is primarily due to the fact that the metal ingredients have different melting points and the molding process does not assure uniformity in the material dispersion nor in the crystal size. Forging can also avoid these tendencies
  • the silicon employed in the piston formation has a primary silicon crystal configuration of greater than 10 ⁇ m in size.
  • thy is a likelihood that the primary crystal silicon particles in the skirt portion will become fractured when forging. This can cause cracks to be formed in the boundaries between the silicon particles and the remainder of the matrix. This reduces the fatigue strength of the skirt portion substantially.
  • a first feature of this invention is adapted to be embodied in a method of forming a piston for a reciprocating machine such as an engine.
  • the piston is formed from a powdered material that is comprised of aluminum alloyed with a material selected from the group of silicon (Si) and iron (Fe) having a particle diameter not greater than 10 ⁇ m.
  • the resulting alloy is then forged into a piston having a piston head and a piston skirt
  • the powder which is solidified is formed by a process comprising the steps of forming an ingot from the alloy and the aluminum and alloying material. This ingot is then melted and dispersed as a liquid in a chilling stream to form powdered metal particles. These powdered metal particles are then compressed into a blank having a cylindrical configuration for subsequent forging.
  • FIG. 1 is a side elevational view of a finished piston constructed in accordance with an embodiment of the invention and formed utilizing materials embodying the invention.
  • FIG. 2 is a top plan view of the piston.
  • FIG. 3 is a cross-sectional view taken along the line 3--3 of FIG. 2.
  • FIG. 4 is a series of views showing the various processes and the steps through which the piston is formed in accordance with the invention.
  • FIG. 5 is a cross-sectional view showing a step of the forging technique.
  • FIG. 6 is a cross-sectional view showing the final forging step.
  • FIG. 7 is a three-part view comprised of photographs of the metal components of the material from which the piston is formed in the embodiments of the invention, shown in Parts A and B, and compared with a conventional piston material construction, as shown in Part C.
  • FIG. 8 is a graphical view showing the abrasion resistance of two examples of the invention (A & B) in relation to a conventional structure (C).
  • FIG. 9 is a graphical view showing the fatigue strength of the aforenoted materials constructed in accordance with the invention and the prior art type construction under varying heat conditions.
  • a piston formed in accordance with a method embodying the invention and utilizing materials also embodying the invention is identified generally by the reference numeral 21.
  • the piston 21 is comprised of a head portion 22 and a skirt portion 23.
  • the head portion 22 is formed with a top surface 24 which forms the combustion chamber facing portion of the piston 21.
  • This head portion has formed below it ring grooves 25 which are machined and from which the skirt portion 23 depends.
  • Piston pin bosses 26 are formed in the interior of the piston 21 and are machined to form piston pin receiving bores 27.
  • the general construction of the piston 21 as thus far described may be considered to be conventional.
  • the invention here deals with the method by which the piston 21 is formed and the material employed to form the piston and the way in which this material is formed into a blank from which the piston 21 may be forged.
  • FIG. 4 is a graphical view that shows the various steps in the forging process and including the steps by which the material from which the piston blank is forged is formulated and manufactured.
  • the step 1 indicates the formation of the ingot from which the powdered metal is formed and from which at least a substantial portion of the material of the final piston will be forged.
  • This ingot is formed from an alloy of aluminum and certain alloying materials which are added to improve its strength, abrasion resistance and resistance to deterioration under heat Basically, this ingot is formed from an aluminum alloy that consists of aluminum (Al) as a base material and certain alloying materials such as silicon (Si), iron (Fe), and other materials as will be noted.
  • Al aluminum
  • Si silicon
  • Fe iron
  • alloying materials may not be included directly in the ingot but may be formed as separate powders which are then mixed with the ingot powder during the extrusion and heating step that forms the formed metal blanks for forging.
  • silicon carbide SiC is one of such materials that may be seperately mixed with the powder formed from the ingot.
  • a first example of the material from which the ingot may be formed includes as alloying materials to the base aluminum (Al) the following alloying elements:
  • the silicon alloying material improves abrasion resistance and resistance to cracking or breaking and is in the form of hard primary crystals or eutectic crystals in the metal texture.
  • Iron is added to obtain high strength at temperatures of 200° C. or more and by disbursing and strengthening the metal texture.
  • Copper and magnesium are added to improve the strength at temperatures less than 200° C. It has been found that amounts greater than outside the ranges specified may fail to obtain the desired abrasion resistance and strength at the varying temperatures.
  • SiC Silicon carbide
  • a specific preferred embodiment employing silicon carbide as an alloying agent and falling within the range of Example 3 includes the following components:
  • Al 2 O 3 aluminum oxide
  • AIN aluminum nitride
  • the crystalline size of certain of the alloying materials is important in obtaining the desired abrasion resistance, resistance to cracking and high fatigue strength.
  • the initial crystalline silicon particle diameter should be not greater than 10 ⁇ m.
  • the average particle diameter of the iron should be not greater than 10 ⁇ m.
  • these alloying materials may be either incorporated in the ingot from which the powder is formed or may be formed from separate particles that are molded into the pellet through mixing with the particles formed from the primary aluminum alloy. Either method can be employed so long as the resulting crystalline particle size is within the range set forth.
  • Example 3 and Example 4 it is particularly advantageous to add the silicon carbide (SiC) as a separate powder mixed with the powder from the ingot before solidifying. If this is done the particle size of the silicon carbide (SiC) powder before mixing should preferably be 5 ⁇ m.
  • step 2 of FIG. 4 The way in which the particles are formed is shown in step 2 of FIG. 4.
  • the ingot from the alloy and the base materials are melded at a temperature of 700° C. or more.
  • This molten material is then sprayed like a fog and rapidly cooled to solidify at a cooling rate of at least 100° C. per second thereby obtaining a rapidly solidified powder metal of the aluminum alloy.
  • the specific particle size of the wear-resistant material such as the silicon carbide has a diameter of 5 ⁇ m. As has been noted, this is particularly useful when the particles are formed separately and combined in the next step which will be described.
  • the powdered material is formed into a metallic extrusion to form the alloy.
  • the powder can be heated and extruded under pressure at a temperature of less than 700° C. and preferably in the range of 400-500° C. and extruded into a round rod.
  • Other forms can be employed for so forming the resulting pressed material.
  • the heating may be done before the molding so long as the material temperature is maintained. Alternatively, the heating may be done during the actual molding process.
  • a known type of release material is applied to the exterior of the blank.
  • This release material may be of any type known in the forging process.
  • the blank is heated at the step 6.
  • the amount of heat is to bring the blank up to a temperature of less than 700° C. and preferably in the range of 400-500° C. and place the blank into a mold as seen in FIGS. 6 and 7.
  • the female mold is identified by the reference numeral 31 and has a cavity 32 into which the blank, indicated by the reference numeral 33 is applied.
  • a mandrel or closing press 34 is then pressed into the mold as shown in FIG. 6 so as to apply the pressure to extrude or forge the blank 33 into the shape of the finished but unmachined piston 21.
  • the mold 31 and press 34 can be preheated to a temperature less than 700° C. and preferably in the the 400-500° C. temperature range. The blank be placed therein for a time to elevate to this temperature.
  • a heat treating operation may be performed as shown in FIG. 4 at step 8. This is done to improve the strength.
  • a surface coating may be applied to the skirt area 23, if desired.
  • the resulting crystalline structure in finished piston is such that the particle sizes, particularly of the harder elements are much smaller than the prior art type construction as shown in view C of this figure.
  • the conventional technique including silicon results in very large particle sizes.
  • This shows the structure of a cast piston formed from a base aluminum alloyed with 10-22% by weight silicon, 1% by weight or less of iron, 0.5-5% by weight copper, 0.5-2% by weight magnesium, 1% by weight or less of manganese, 1% or less by weight of nickel and 1% by weight or less of copper.
  • This is a type of alloy commonly used in the manufacture of pistons.
  • the specific example and that illustrated in FIG. 7 C has the following specific conventional, composition of aluminum alloy.
  • A is a piston formed from an aluminum alloy containing silicon carbide (Example 4 above) and B is an alloy that contains no silicon carbide (Example 2 above)
  • the particle size is much smaller and as previously noted less than 10 ⁇ m in the case of the silicon and/or silicon carbide.
  • FIGS. 8 and 9 show the comparison of the two aforenoted examples A and B with the conventional structure previously indicated at C.
  • FIG. 8 is an abrasion resistance curve and shows how the abrasion resistance of the materials embodying the invention is substantially improved from the prior art construction.
  • This abrasion test is carried out by forming the piston and then subjecting it to a conventional fretting abrasion test.
  • the area of abrasion marks at the end of this test, which is performed at a temperature of about 250° C. indicates the abrasion resistance. The lower area of abrasion the greater the resistance.
  • FIG. 9 also shows the fatigue strength tested by a cyclic application of sinusoidal pressures to the skirt of the piston during temperatures. Again, it will be seen that the stress amplitude is substantially lower for the number of cycles required to achieve breakage with the conventional structure than those embodying the invention.
  • piston skirt only may be formed from the materials and in the methods described and then bonded and/or otherwise attached to a head formed in a different manner or from different materials.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Forging (AREA)
US09/022,647 1997-02-12 1998-02-12 Piston for internal combustion engine and material therefore Expired - Lifetime US6070323A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP9042951A JPH10219383A (ja) 1997-02-12 1997-02-12 内燃機関用鍛造ピストンおよび鍛造ピストン用素材
JP9-042951 1997-02-12
JP9-044709 1997-02-13
JP4470997A JPH10219378A (ja) 1997-02-13 1997-02-13 鍛造ピストン用素材

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US (1) US6070323A (de)
EP (1) EP0864660B1 (de)
DE (1) DE69814498T2 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6363608B1 (en) * 1997-04-10 2002-04-02 Yamaha Hatsudoki Kabushiki Kaisha Method of manufacturing piston
US20020046593A1 (en) * 2000-10-18 2002-04-25 Carmo Ribeiro Multi-axially forged piston
US6487773B2 (en) * 2001-03-23 2002-12-03 Mahle Gmbh Method of making one-piece piston
US20040129134A1 (en) * 2003-01-08 2004-07-08 Cagney John L. Piston formed by powder metallurgical methods
US20050262962A1 (en) * 2004-05-27 2005-12-01 Cagney John L Non-homogeneous engine component formed by powder metallurgy
US7213337B1 (en) * 2001-03-21 2007-05-08 Thyssenkrupp Automotive Ag Method of manufacturing pistons and components thereof, and forging tools
US20080000444A1 (en) * 2004-03-17 2008-01-03 Federal-Mogul Nuernberg Gmbh Piston for an Internal Combustion Engine, Method for Producing Said Piston and Use of a Copper Alloy in the Production of a Piston
US7398754B2 (en) 2005-09-21 2008-07-15 Honda Motor Co., Ltd. Piston for internal combustion engine
US20090013531A1 (en) * 2005-08-29 2009-01-15 Thyssenkrupp Metalurgica Campo Limpo Ltda. Method, production line, and piston blank used for the production of a monolithic piston for combustion engines, and piston for combustion engines
US7509890B2 (en) 2004-05-27 2009-03-31 International Engine Intellectual Property Company, Llc Non-homogeneous engine component formed by powder metallurgy
US20110030214A1 (en) * 2009-08-05 2011-02-10 Wolfgang Rein Piston assembly multiple step forming process
CN116464568A (zh) * 2023-03-07 2023-07-21 湖南恒裕新材料科技发展有限公司 一种混杂复合铝基耐热活塞及其制造方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE228580T1 (de) 1997-08-30 2002-12-15 Honsel Gmbh & Co Kg Legierung und verfahren zum herstellen von gegenständen aus dieser legierung
DE10135485A1 (de) * 2001-07-20 2003-02-06 Schwaebische Huettenwerke Gmbh Verfahren zur endkonturnahen Fertigung von Bauteilen bzw. Halbzeugen aus schwer zerspanbaren Leichtmetalllegierungen, und Bauteil bzw. Halbzeug, hergestellt durch das Verfahren
DE102007047139B4 (de) * 2007-10-02 2010-11-11 Federal-Mogul Burscheid Gmbh Zylinderlaufbuchse mit hoher tribologischer Belastbarkeit
DE102008018850A1 (de) * 2007-11-30 2009-06-04 Andreas Borst Kolben und Verfahren zu dessen Herstellung

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US1835863A (en) * 1928-08-06 1931-12-08 Champion Machine & Forging Com Method of forming pistons
US3009237A (en) * 1954-01-25 1961-11-21 Lehmeier Carl Piston blanks
US3070414A (en) * 1959-08-03 1962-12-25 Thompson Ramo Wooldridge Inc Piston and method of making same
US4051590A (en) * 1972-10-19 1977-10-04 Cincinnati Incorporated Method for hot forging finished articles from powder metal preforms

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JPS63126661A (ja) 1986-11-17 1988-05-30 Suzuki Motor Co Ltd ピストンの製造方法
FR2624137B1 (fr) * 1987-12-07 1990-06-15 Cegedur Pieces en alliage d'aluminium, telles que bielles notamment, ayant une resistance a la fatigue amelioree et procede de fabrication
JPH01180927A (ja) * 1988-01-13 1989-07-18 Toyota Motor Corp ピストン製造方法
JP2552523B2 (ja) * 1988-04-01 1996-11-13 本田技研工業株式会社 内燃機関のシリンダスリーブとピストンの組合せ
JPH05320788A (ja) 1992-05-19 1993-12-03 Toyota Motor Corp 高耐摩耗性金属基複合材料及びその製造方法
JPH06323193A (ja) * 1993-05-12 1994-11-22 Mitsubishi Alum Co Ltd ディーゼルエンジン用ピストン

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1835863A (en) * 1928-08-06 1931-12-08 Champion Machine & Forging Com Method of forming pistons
US3009237A (en) * 1954-01-25 1961-11-21 Lehmeier Carl Piston blanks
US3070414A (en) * 1959-08-03 1962-12-25 Thompson Ramo Wooldridge Inc Piston and method of making same
US4051590A (en) * 1972-10-19 1977-10-04 Cincinnati Incorporated Method for hot forging finished articles from powder metal preforms

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6363608B1 (en) * 1997-04-10 2002-04-02 Yamaha Hatsudoki Kabushiki Kaisha Method of manufacturing piston
US20050034598A1 (en) * 2000-10-18 2005-02-17 Carmo Ribeiro Multi-axially forged piston
US20020046593A1 (en) * 2000-10-18 2002-04-25 Carmo Ribeiro Multi-axially forged piston
US7870669B2 (en) 2000-10-18 2011-01-18 Federal-Mogul Corporation Multi-axially forged piston
US6840155B2 (en) 2000-10-18 2005-01-11 Federal-Mogul World Wide, Inc. Multi-axially forged piston
US7213337B1 (en) * 2001-03-21 2007-05-08 Thyssenkrupp Automotive Ag Method of manufacturing pistons and components thereof, and forging tools
US6487773B2 (en) * 2001-03-23 2002-12-03 Mahle Gmbh Method of making one-piece piston
US6973723B2 (en) 2003-01-08 2005-12-13 International Engine Intellectual Property Company, Llc Piston formed by powder metallurgical methods
US20040129134A1 (en) * 2003-01-08 2004-07-08 Cagney John L. Piston formed by powder metallurgical methods
US20080000444A1 (en) * 2004-03-17 2008-01-03 Federal-Mogul Nuernberg Gmbh Piston for an Internal Combustion Engine, Method for Producing Said Piston and Use of a Copper Alloy in the Production of a Piston
US7509890B2 (en) 2004-05-27 2009-03-31 International Engine Intellectual Property Company, Llc Non-homogeneous engine component formed by powder metallurgy
US7299715B2 (en) 2004-05-27 2007-11-27 International Engine Intellectual Property Company, Llc Non-homogeneous engine component formed by powder metallurgy
US20050262962A1 (en) * 2004-05-27 2005-12-01 Cagney John L Non-homogeneous engine component formed by powder metallurgy
US20090013531A1 (en) * 2005-08-29 2009-01-15 Thyssenkrupp Metalurgica Campo Limpo Ltda. Method, production line, and piston blank used for the production of a monolithic piston for combustion engines, and piston for combustion engines
US8572843B2 (en) * 2005-08-29 2013-11-05 Thyssenkrupp Metalurgica Campo Limpo Ltda. Method, production line, and piston blank used for the production of a monolithic piston for combustion engines, and piston for combustion engines
US7398754B2 (en) 2005-09-21 2008-07-15 Honda Motor Co., Ltd. Piston for internal combustion engine
US20110030214A1 (en) * 2009-08-05 2011-02-10 Wolfgang Rein Piston assembly multiple step forming process
CN102574252A (zh) * 2009-08-05 2012-07-11 马勒国际公司 活塞组件多级形成处理
CN116464568A (zh) * 2023-03-07 2023-07-21 湖南恒裕新材料科技发展有限公司 一种混杂复合铝基耐热活塞及其制造方法

Also Published As

Publication number Publication date
EP0864660A2 (de) 1998-09-16
DE69814498T2 (de) 2003-11-20
DE69814498D1 (de) 2003-06-18
EP0864660B1 (de) 2003-05-14
EP0864660A3 (de) 1999-09-29

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